Daniel Pomarède
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pomarede.bsky.social
Daniel Pomarède
@pomarede.bsky.social
7.4K followers 270 following 2.9K posts
Cosmographer at Univ. Paris-Saclay | mapping the Universe | co-discoverer of Laniakea (our home supercluster of galaxies), Hoʻoleilana, and some other (very) large scale structures
📖 https://orcid.org/0000-0003-2038-0488
▶️ https://vimeo.com/pomarede
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On the cover of Nature's new issue: Little Red Dots - Enigmatic objects in the distant Universe could be young black holes in a cocoon of gas. 🧪🔭

Credit image: The CEERS Survey/The JADES Survey/PRIMER/The UNCOVER survey/Dawn JWST Archive

www.nature.com/nature/volum... @nature.com
A cover of the Nature journal, dated 15 january 2026. The cover image shows a mosaic of arbitrarily arranged snapshots taken by the James Webb Space Telescope (JWST), each of which is centred on a distant galaxy containing a ‘little red dot’. First observed by the JWST in 2022, these enigmatic red objects have posed a problem for astronomers, who have fiercely debated whether they represent young, star-filled galaxies or unexpectedly massive black holes accreting gas. In this week’s issue, Vadim Rusakov and colleagues aim to resolve this issue with an analysis of the hydrogen spectra from these dots — and they find that neither suggestion is quite right. Instead, they find that the little red dots are young supermassive black holes — much smaller than was previously thought — and that the light does not come directly from the gas being accreted by the black holes, but from the dense cocoon of electrons that surrounds them.
January 16, 2026 at 9:39 AM
pomarede.bsky.social
Hubble’s Album of Planet-Forming Disks

This collection of new images taken by NASA’s Hubble Space Telescope showcases protoplanetary disks, the swirling masses of gas and dust that surround forming stars, in both visible and infrared wavelengths. 🧪🔭

science.nasa.gov/missions/hub...
Four images captured in visible light showcasing jets of gas blasting from protostars. From left to right and top to bottom: 1) HH 390’s outflow is accompanied by a one-sided nebula, evidence that the protoplanetary disk is not viewed edge-on from our perspective. 2) Tau 042021 is a large, symmetrical disk seen edge-on, and is in a late stage of dust evolution, since the dust particles have clumped together into larger grains. 3) HH 48 is a binary protostar system in which gravitational tidal forces from the larger star appear to be influencing the disk of the secondary object. 4) ESO Hα574 is a very compact disk with a “collimated” ― or beam-like and linear ― outflow, and one of the faintest edge-on disks yet recognized. Credits: NASA, ESA, and K. Stapelfeldt (Jet Propulsion Laboratory); Processing: Gladys Kober (NASA/Catholic University of America) Bright central protostars and the shadows of their dusty disks appear in these four infrared images. Credits: NASA, ESA, and T. Megeath (University of Toledo); Processing: Gladys Kober (NASA/Catholic University of America)
January 16, 2026 at 9:27 AM
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Cosmography archives

First Approximation to a Chart of the Nubecula Major, or greater Magellanic Cloud. 🧪🔭

by John Herschel (1847)
ui.adsabs.harvard.edu/abs/1847raom...
Plate X from John Herschel's book "Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope; being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825" featuring an unfolded map of the Large Magellanic Cloud, giving the positions and either the magnitudes or classes of stars and nebulae versus right ascension and N.P.D. North Pole Distance. A number of regions of interest are delineated by rectangles with references to other plates and figures featured in the book.
January 14, 2026 at 2:35 PM
pomarede.bsky.social
Au programme au Mac Mahon: hommage à Brigitte Bardot et rétrospective Michel Piccoli
Le cinéma Mac Mahon à Paris.
January 12, 2026 at 5:43 PM
pomarede.bsky.social
Publicité pour Le Savant Fou, une aventure extraordinaire d'Adèle Blanc-Sec, par Jacques Tardi, trouvée dans les pages de Métal Hurlant n°17 (Mai 1977)
Une illustration en noir et blanc d'Adèle Blanc-Sec impressionnée par la lecture de ses propres aventures.
January 11, 2026 at 2:39 PM
pomarede.bsky.social
Cosmography archives

Astronomical Observations relating to the Construction of the Heavens, arranged for the Purpose of a critical Examination, the Result of which appears to throw some new Light upon the Organization of the celestial Bodies. 🧪🔭

by William Herschel (1811)
The 42 figures, laid over two plates, depicting the observations discussed by Herschel in his paper.
January 9, 2026 at 11:59 AM
pomarede.bsky.social
The SKA Observatory’s growing telescope array in South Africa, SKA-Mid, has achieved “first fringes” using two of its dishes, a milestone that demonstrates it is operating as an interferometer for the first time. 🧪🔭 #SKAO

www.skao.int/en/news/693/...
One of the seven SKA-Mid dishes now constructed on site in South Africa's Northern Cape, with SARAO's MeerKAT radio telescope in the background. Credit: SKAO/Max Alexander.
January 8, 2026 at 8:59 PM
pomarede.bsky.social
It's Stephen Hawking's birthday. The occasion to share this fantastic video he produced as part of his Genius documentatry series. Hawking elaborates on our place in the Universe, including our membership to the Laniakea supercluster of galaxies that we discovered back in 2014. 🧪🔭
January 8, 2026 at 5:38 PM
pomarede.bsky.social
I have been using daily this "Sytadin" traffic jams monitoring app for the Greater Paris area since its inception in 1996, and I have never seen that! 1000 kilometers of traffic jams...
Traffic jams plot rising above 1000 km Maps of traffic jams around Paris
January 5, 2026 at 6:01 PM
pomarede.bsky.social
Paris sous la neige
L'Arc de Triomphe sous la neige Les Champs Elysées sous la neige Avenue Foch sous la neige Avenue Foch
January 5, 2026 at 5:01 PM
pomarede.bsky.social
Vacations reads
The cover of "Le vaisseau de pierre" by Enki Bilal and Pierre Christin; Dargaud collection Histoires Fantastiques, légendes d'aujourd'hui (1976). The cover of Vicente Segrelles' "Le Mercenaire" 4th episod "Le sacrifice", ed. Glénat 1988. The cover of "Les Aventures d'Alef-Thau" episod 4 "Le seigneur des illusions" by Jodorowsky and Arno, ed. Les Humanoïdes Associés, Collection Eldorado, 1988. The cover of the Blueberry story 23rd episod "Arizona Love" by Charlier and Giraud, Alpen Publishers, 1990.
December 29, 2025 at 9:33 AM
pomarede.bsky.social
Holiday Collection: Cosmic Holiday Greetings From NASA's Chandra X-ray Observatory

Four new winter-themed images that contain X-rays from Chandra and data from other telescopes have been released. 🔭🧪

chandra.harvard.edu/photo/2025/h...
Four colorful composite images, each evoking an aspect of winter and the holiday season. The first image, at upper left, features a pair of colliding galaxies that resembles a snowman in optical light from Hubble when oriented vertically. The two galaxies, NGC 4782 and NGC 4783, appear as hazy white balls with solid white cores. Linking the two galaxies is a bridge of hot gas in X-ray light from Chandra depicted here as a string of fuzzy neon purple balls. The string of gas loosely zigzags back and forth between the two galaxies, like a cozy scarf worn by a snowman. The second image, at upper right, strongly resembles a golden Christmas tree bedecked with twinkling lights. The tree is actually NGC 2264, a relatively young nebula where new stars are forming. The tree's branches, which sweep back and forth in a roughly conical shape, are golden clouds of dust and gas, all from optical light captured by an astrophotographer. Tucked into these branches are colorful lights and glowing baubles in X-rays from Chandra and XMM-Newton; baby stars growing inside the nebula. At lower left is a winter scene fit for a holiday greeting card. Above what appears to be a fantastical snowy mountainscape, is a brilliant blue sky packed with colorful lights. The golden mountainscape is in fact part of the nebula NGC 6357, as captured by JWST. The green, red, and golden lights in the blue sky above are bursts of high-energy X-rays from active stars, detected by Chandra. The last image at lower right is a nebula which calls to mind the first gift in the Christmas carol 'The Twelve Days of Christmas'. Here, the wispy burnt orange nebula, M78, forms a tree, with a vertical trunk near the center of the image in infrared and optical light from Euclid. The tree's bushy branches reach toward our upper left, and its tail of roots drifts toward our lower right.
December 23, 2025 at 10:40 AM
pomarede.bsky.social
An update to the huge Sol 1717 mosaic currently being transferred from Perseverance. More to come.

🔍 zoomhub.net/OVqq9

#Mars 🧪🔭

Credits: NASA/JPL-Caltech/ASU
An ochre toned mosaic of images capturing a Martian landscape, with some elements of the Mars rover Perseverance in the foreground.
December 22, 2025 at 6:37 PM
pomarede.bsky.social
Beautiful view from the Sol 1717 delivery of Mastcam images

🔍 zoomhub.net/rNGGp

#Mars 🧪🔭

Credits: NASA/JPL-Caltech/ASU
An ochre toned mosaic of images capturing a Martian landscape.
December 21, 2025 at 6:42 PM
pomarede.bsky.social
Wow, a huge lot of Mastcam images from Percy are on their way

#Mars 🧪🔭

rkinnett.github.io/roverpics/ @rkinnett.bsky.social
A screenshot of the roverpics app mentioning 2389 images for the Sol 1717 delivery.
December 21, 2025 at 10:16 AM
pomarede.bsky.social
A mosaic of 66 images captured three days ago by Curiosity

#Mars Dec. 17, 2025 - Sol 4751 🧪🔭
Credits images: NASA/JPL-Caltech/MSSS/fredk
Mars rocks. Layered rocks. Layered rocks.
December 20, 2025 at 7:06 PM
pomarede.bsky.social
NASA’s Parker Solar Probe Observes Interstellar Comet 3I/ATLAS

The images offer a valuable look at the comet over a period when it couldn’t be seen from Earth because it appeared too close to the Sun from Earth’s perspective.

science.nasa.gov/blogs/parker...

#3IATLAS 🧪🔭
December 20, 2025 at 11:39 AM
pomarede.bsky.social
A microscopic particle of asteroid Bennu, brought to Earth by NASA’s OSIRIS-REx mission, is manipulated under a transmission electron microscope. Researchers first reinforced it with thin strips of platinum (the “L” shape) then welded a tungsten microneedle to it. 🧪🔭

www.nasa.gov/centers-and-...
December 19, 2025 at 2:10 PM
pomarede.bsky.social
NASA’S PUNCH Releases Refined Images of Eruptions from the Sun

science.nasa.gov/blogs/punch/...

Video shows coronal mass ejections erupting from the Sun’s surface from Oct. 21 to Nov. 12, 2025. Comet C/2025 A6 (Lemmon) is seen at the top, Venus at the left, and Mercury to the right of center. 🧪🔭
December 19, 2025 at 9:20 AM
pomarede.bsky.social
TIL that ORCID has a "Featured works" section, so let's do it ⤵️

orcid.org/0000-0003-20...
Screenshot of my ORCID page with the Featured works section deployed.
December 18, 2025 at 3:03 PM
pomarede.bsky.social
Rubin in Bloom

At Vera C. Rubin Observatory in Chile, December brings summer light and blooming flowers, offering a unique seasonal view.

Credit: NSF-DOE Vera C. Rubin Observatory/NOIRLab/SLAC/AURA/A. Alexov
noirlab.edu/public/image... 🧪🔭
The Rubin Observatory with yellow flowers in the foreground.
December 18, 2025 at 2:08 PM
pomarede.bsky.social
#APOD Astronomy Picture of the Day

Andromeda and Sprites over Australia

By JJ Rao naturebyjj.com

apod.nasa.gov/apod/ap25121...

Check out JJ's video on how this red sprite, a rare, luminous electrical discharge high above thunderstorms near the edge of space, was captured: youtu.be/XJWQhewM0C8 🧪🔭
The Andromeda galaxy and a red sprite, a type of lightning that lasts a fraction of a second and occurs above violent thunderstorms, captured side-by-side, above a boab tree standing alone in an otherwise barren landscape.
December 16, 2025 at 11:07 AM
pomarede.bsky.social
View of Percy's front hazard avoidance cameras was selected by public vote and featured as Perseverance Raw Image of the Week #Mars 🧪🔭

mars.nasa.gov/mars2020/mul...
Screenshot of the Perseverance raw images webpage, featuring some details on the selected image captured by the WATSON Camera, and boasting a number of votes of 106.
December 15, 2025 at 5:00 PM
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Awesome: new selfie captured by Percy, portrayed with the rim of Jezero Crater at her back. Since summer 2024, the rover has ascended and traversed the crater rim and is now set to explore the plains to its west. What a journey!

#Mars Dec. 12, 2025 - Sol 1711 🧪🔭
Credits images: NASA/JPL-Caltech
The mast head of the Mars rover Perseverance, with the mountainous rim of Jezero Crater in the background. The head hosts a number of cameras and other scientific instruments and sensors. Rover tracks can be seen receding in the back behind the mast.
December 14, 2025 at 3:12 PM
pomarede.bsky.social
Stereo3D view of Curiosity at work in a trough of the boxwork structure, captured yesterday

To go 3D: eyes' lines of sight parallel/left image for left eye/right image for right eye.

#Mars Sol 4747 - Dec. 13, 2025 🧪🔭
Credits images: NASA/JPL-Caltech
A dual left/right stereoscopic pair of black and white photographies capturing the Mars rover Curiosity robotic arm, instrumented turret, front wheels, with the right wheel projecting its shadow on the foreground. This dual image is intended to be used to obtain a Stereo3D rendition of the scene through parallel viewing, and not cross-eyed viewing.
December 14, 2025 at 9:41 AM